وَلا يَزَالُ الَّذِينَ كَفَرُوا فِي مِرْيَةٍ مِنْهُ حَتَّى تَأْتِيَهُمُ السَّاعَةُ بَغْتَةً أَوْ يَأْتِيَهُمْ عَذَابُ يَوْمٍ عَقِيمٍ
“and those who disbelieve will not cease to be In doubt about it (this Qur'ân) until the Hour comes suddenly upon them, or there comes to them the torment of the Day after which there will be no night (i.e. the Day of Resurrection)”
“ those who reject Faith will not cease to be In doubt concerning (revelation) until the Hour (of judgment) comes suddenly upon them, or there comes to them the penalty of a Day of Disaster”